CELLULAR RESPIRATION
Chemical Energy Harvest
Modified from Johnson
Items to be covered in
Cellular Respiration Lab
 Metabolism
 Anaerobic
respiration
 Aerobic respiration
METABOLISM – The Fire
of Life
Metabolism-the sum total of all
biochemical activity in a living
organism
 Anabolic metabolism- “building
up” (e.g.; photosynthesis,
protein synthesis)
 Catabolic metabolism“breaking down” (e.g.; cellular
respiration)

METABOLISM – Chemical
Energy Harvest
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Cellular respiration - the energy
yielding process in all living things
that converts chemical energy from
food into a usable ATP energy that
can be used for cell activities.
Anaerobic Respiration and
Aerobic Respiration are two different
metabolic pathways of cellular
respiration.
METABOLISM
Metabolic Pathways
Glucose Sugar
C6H12O6
Anaerobic respiration
Without Oxygen
Alcohol Fermentation
Lactic Acid Fermentation
= Ethyl Alcohol +CO2 +2ATP's
C2H5oh +CO2+2ATP's
= Lactic Acid +2ATP's
C3H6O3 + 2ATP's
Aerobic Respiration
With Oxygen
= water +CO2 + 36 ATP's
ANAEROBIC
RESPIRATION
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Anaerobic means “without air” and
takes place in the absence of
oxygen (O2).
Occurs in yeast, bacteria, and (when
necessary) animal muscle cells.
Takes place in the cytoplasm of the
cell (mitochondria not required).
Yields 2 ATP’s per molecule of
glucose sugar (much less efficient
than aerobic respiration).
ANAEROBIC
RESPIRATION –
Yeast cell
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Yeast are microscopic, unicellular
fungi that are important for producing
bread and alcoholic beverages.
Anaerobic respiration in yeast is
known as fermentation.
Glucose = ethyl alcohol + carbon
dioxide + energy (2 ATP’s)
The bubbles of carbon dioxide cause
dough to rise and produce leaven
bread.
AEROBIC RESPIRATION
Aerobic respiration requires
oxygen (O2). Occurs in most
plants and animals.
 Takes place in the mitochondria.
 Most efficient means of
respiration; yields 36 ATP’s of
energy per molecule of glucose.
 Overall reaction glucose + oxygen
= carbon dioxide + water + energy
(36 ATP’s)
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AEROBIC RESPIRATION
Mitochondria
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The “powerhouse” of the
cell. Site for Kreb’s cycle
and aerobic respiration
Numerous cristae serve
as a workbench for
production of ATP’s